Welcome and thanks for posting your query to Healthcare Magic.
After reading your short query it appears the possibility of "Urticaria" recurring after a period of 6 years.
This is a common condition caused by bursting of allergy
producing cells known as "mast cells". As the chemical inside them is released it produces a rash
which you have mentioned. There can be multiple factors producing this condition which are included in day to day life and some times it is really difficult to find one exact cause.
For the betterment you can apply over the counter calamine
lotion 3-4 times a day. You can do cold
water compresses to reduce the intensity of itching. Do not scratch or rub the skin as it can lead to further aggravation.
You can take oral anti histamine
or levocetrizine under medial advise.
Kindly don't get panicky about the situation as I told it is totally a simple and manageable condition. It never turns to any serious disease. If you have any fear of anything serious in your mind then kindly relieve the tension of the same.
Despite above measures if the problem is not getting better then it is better to consult a dermatologist
for best guidance.
Hope these informations will help.
"With good health wishes"
Dr Sanjay Kumar Kanodia
MD (Dermatology & STDs)